Estimating permeability from field measurements of seismic attenuation in fractured chalk
Broadband (100-4000 Hz) cross-hole seismic data have been acquired at a borehole test site where extensive hydrological investigations have previously been performed, including <em>in situ</em> estimates of permeability. The rock type is homogeneous chalk and fractures and bedding planes...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal article |
| Language: | English |
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Wiley
2007
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| _version_ | 1797054810355138560 |
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| author | Payne, S Worthington, M Odling, N West, L |
| author2 | European Association of Geoscientists & Engineers |
| author_facet | European Association of Geoscientists & Engineers Payne, S Worthington, M Odling, N West, L |
| author_sort | Payne, S |
| collection | OXFORD |
| description | Broadband (100-4000 Hz) cross-hole seismic data have been acquired at a borehole test site where extensive hydrological investigations have previously been performed, including <em>in situ</em> estimates of permeability. The rock type is homogeneous chalk and fractures and bedding planes have been identified from well logs. High values of seismic attenuation, Q = 22 ≤ 27 ≤ 33, were observed over a 10 m depth interval where fracture permeability values of 20-50 darcy had been recorded. An attempt has been made to separate the attenuation due to scattering and intrinsic mechanisms. The estimated values of intrinsic attenuation, Q = 31 ≤ 43 ≤ 71, have been reproduced using a number of current theories of seismic-wave propagation and fluid-flow-induced seismic attenuation in cracked and fractured media. A model that considers wavelength-scale pressure gradients is the preferred attenuation mechanism. Model parameters were obtained from the hydro-geological and seismic data. However, we conclude that it is not possible to use seismic Q to measure rock permeability remotely, principally because of the inherent uncertainties arising from model parameterisations. |
| first_indexed | 2024-03-06T19:02:31Z |
| format | Journal article |
| id | oxford-uuid:1405c227-5b41-4d92-ac52-221e0c20de61 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:02:31Z |
| publishDate | 2007 |
| publisher | Wiley |
| record_format | dspace |
| spelling | oxford-uuid:1405c227-5b41-4d92-ac52-221e0c20de612022-03-26T10:17:16ZEstimating permeability from field measurements of seismic attenuation in fractured chalkJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:1405c227-5b41-4d92-ac52-221e0c20de61Earth sciencesEnglishOxford University Research Archive - ValetWiley2007Payne, SWorthington, MOdling, NWest, LEuropean Association of Geoscientists & EngineersBroadband (100-4000 Hz) cross-hole seismic data have been acquired at a borehole test site where extensive hydrological investigations have previously been performed, including <em>in situ</em> estimates of permeability. The rock type is homogeneous chalk and fractures and bedding planes have been identified from well logs. High values of seismic attenuation, Q = 22 ≤ 27 ≤ 33, were observed over a 10 m depth interval where fracture permeability values of 20-50 darcy had been recorded. An attempt has been made to separate the attenuation due to scattering and intrinsic mechanisms. The estimated values of intrinsic attenuation, Q = 31 ≤ 43 ≤ 71, have been reproduced using a number of current theories of seismic-wave propagation and fluid-flow-induced seismic attenuation in cracked and fractured media. A model that considers wavelength-scale pressure gradients is the preferred attenuation mechanism. Model parameters were obtained from the hydro-geological and seismic data. However, we conclude that it is not possible to use seismic Q to measure rock permeability remotely, principally because of the inherent uncertainties arising from model parameterisations. |
| spellingShingle | Earth sciences Payne, S Worthington, M Odling, N West, L Estimating permeability from field measurements of seismic attenuation in fractured chalk |
| title | Estimating permeability from field measurements of seismic attenuation in fractured chalk |
| title_full | Estimating permeability from field measurements of seismic attenuation in fractured chalk |
| title_fullStr | Estimating permeability from field measurements of seismic attenuation in fractured chalk |
| title_full_unstemmed | Estimating permeability from field measurements of seismic attenuation in fractured chalk |
| title_short | Estimating permeability from field measurements of seismic attenuation in fractured chalk |
| title_sort | estimating permeability from field measurements of seismic attenuation in fractured chalk |
| topic | Earth sciences |
| work_keys_str_mv | AT paynes estimatingpermeabilityfromfieldmeasurementsofseismicattenuationinfracturedchalk AT worthingtonm estimatingpermeabilityfromfieldmeasurementsofseismicattenuationinfracturedchalk AT odlingn estimatingpermeabilityfromfieldmeasurementsofseismicattenuationinfracturedchalk AT westl estimatingpermeabilityfromfieldmeasurementsofseismicattenuationinfracturedchalk |